Weighing and loading equipment adopts single-loop PID control, the control parameters include: proportionality P, integral time I, differential time D, control period Ts. In addition to this, it also adopts serial loop. That is, when the output of one controller is required to change the given value of another controller, the two controllers thus connected are said to be in series. Both controllers have their own measuring inputs, but only the main controller has its own independent given value, and the output signals of the secondary controller are sent to the controlled process. The speed of the feed pump, the internal temperature regulation of the reactor and the tandem control of the viscosity and vacuum are controlled by means of a weighing module.
020-34563445The weighing and feeding system mainly uses the energy of airflow to convey liquid+powder materials along the direction of airflow in a closed pipe, which is a specific application of fluidization technology. Pneumatic conveying device is simple in structure and convenient in operation, it can be used for horizontal, vertical or inclined direction conveying, and in the process of conveying, it can also be used for physical operations such as heating, cooling, drying, airflow classification or some chemical operations. Compared with mechanical conveying, pneumatic conveying system consumes more energy, the particles are easy to break, and the equipment is easy to be abraded. More water content, adhesion or in high-speed movement is prone to generate static electricity materials, should not be pneumatic conveying. Pneumatic conveying is mainly characterized by large conveying capacity, long conveying distance, high conveying speed; can be loaded in one place, and then unloaded in many places. Weighing and batching equipment can solve a variety of problems in measuring and mixing, we have many years of experience in the development and production of automatic weighing and batching equipment for plastics, as well as many actual cases of automatic weighing and feeding equipment for plastics.
Weighing and batching equipment in the first in the meter to enter the formula, start batching, PLC detects the scale is in the zero range, start to start the first material slow batching (as long as a kind of speed, pick up the slow batching of the meter), to the amount of slow batching, the pneumatic ball valve is closed, the meter is overdifference detection, detection is complete, the delay, and then begin to batch the second kind of material, the third kind of material, the fourth kind of material, to be the fourth kind of material batching finished When the 4th material is finished, if there is over-difference, it will output over-difference alarm, and then the meter will output unloading signal and wait for unloading. If there is any fault in the process of dosage, the meter can be aborted at any time for dosage.
The design of automatic weighing and dosing equipment adopts HMI+PLC system, which integrates multiple load cells and actuators into a powerful weighing and dosing control system, and it can be applied to various chemical operation units which require precise control and measurement of quantitative dosage.
All the equipment of the dosage unit is centrally mounted on a steel base, and the complete set includes a Weighing system, a heating and holding system, a liquid Dosage system and an automatic control system.
The weighing system consists of weighing module, weighing platform, level adjuster and accessories.
The heating and holding system consists of storage tank, mixer, liquid level meter, solenoid valve and pipeline.
Liquid dosing system consists of dosing pump, safety valve, back pressure valve, pulse damper, pressure gauge, ball valve, pipe mixer, pipeline and accessories.
